摘要
在车载自组网(VANET)中,车流量到达一定密度时会造成信道拥塞,导致协作式安全应用失效。针对该问题,设计了一个基于信道负载预测的车联网信标消息传输功率控制算法。通过信道忙时比率(CBR)评估当前时刻信道负载,根据差分自回归移动平均模型(ARIMA)对信道下一时刻负载进行预测,将信道负载预测值与预设阈值进行比较,自适应调整下一时刻信标传输功率,避免信道拥塞。通过仿真实验表明,该算法能有效减少通信传输时延,避免信道拥塞,保证数据的可靠转发。
In VANET,when traffic flow reaches a certain density will cause the channel congestion,thus causing inefficiency of cooperative security applications. Aiming at this issue,this paper designed a beacon message transmission power control algorithm based on channel load forecasting. First of all,it evaluated the current time channel load by channel busy time ratio( CBR). Secondly,it predicted the next time channel load by the autoregressive integrated moving average model( ARIMA).Finally,it compared the value of channel load forecasting with the preset threshold,and adaptived adjustment of the next moment transmission power to avoid channel congestion. The simulation experiment shows that the algorithm can effectively reduce the communication transmission delay and avoid channel congestion,ensuring that the data be sent reliably.
引文
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